I'm not quite sure but I'd say 1 and 4.
The last one: the arc AB is a semicircle.
a semicircle is 180 degrees
Answer:
Part A = 90
Part B = 145
Step-by-step explanation:
For part A, we know that a triangle has a sum of 180 degrees. So we just add the angles we already know and then subtract them from 180. For part B, we know that angle ACB and angle ACD are supplementary angles, meaning they add up to 180 degrees. So just take 180 and subtract 35 to find the measure of angle ACD.
The sum is 41.22 because first you turn all of the fractions into decimals and then it’s easier to add them all together all at once.